ENCW201FinalExam119Questionswith
CompleteSolutions.
What is an animal's niche? How many dimensions can a niche have? Can animals share a
niche? - Correct Answer An animal's niche is the functional role of an organism considered
in the environment in which it lives, its "job." A niche is multidi...
ENCW 201 Final Exam 119 Questions with
Complete Solutions.
What is an animal's niche? How many dimensions can a niche have? Can animals share a
niche? - Correct Answer An animal's niche is the functional role of an organism considered
in the environment in which it lives, its "job." A niche is multidimensional (3 dimensions). No
two organisms can occupy the same niche at the same time in the same place.
What is a specialist vs a generalist? - Correct Answer -Specialist: narrow range of
tolerance for one or more things
-Generalist: broad ranges can handle all sorts of things (tend to be invasive species)
-ex) Range of tolerance (what temperatures you can tolerate)
Food (can eat a lot vs just eat one thing)
What is logistic growth? - Correct Answer -Realistic growth rate (logistics of life)
-As you start to reach carrying capacity you get less and less of population growth
What limiting factors might lead to a given (K) carrying capacity? - Correct Answer -Density
dependent factors → causes higher mortality or decreased birth rate as population
increases (starvation, disease)
-Density independent factors → causes higher mortality or decreased birth rate regardless
of population (cold, draught)
-Factors such as food, water, and shelter, ass well as an excess in predator are limiting
factors that might lead to a given carrying capacity.
What is the energy pyramid? What is at the bottom? What is at the top? Where is the most
energy and the least energy? Where is the most biomass and least biomass? Where is the
highest number of individuals and lowest number? - Correct Answer The energy pyramid is
a graphical model of energy flow in a community. Only about 10% of energy used in one
trophic level is available for the next consecutive level. Producers are at the bottom while
tertiary consumers are at the top. The most energy is at the bottom and the least energy is
at the top. The most biomass is at the bottom and the least biomass is at the top. First level
(producers) has the highest number of individuals.
What are often the most important components of an animal's habitat? - Correct Answer -
Food
,-Shelter (cover)
-Water
-Space
(food and shelter are the most important)
What is natural selection? - Correct Answer The process that determines which individuals
will pass on their genes to the next generation
What are Biomes? - Correct Answer -Sets of similar organisms and ecosystems
-Does not have to have the same species to be the same biome (have to be similar
species)
How does biodiversity change as we get nearer to the poles or conversely, closer to the
equator? - Correct Answer less biodiversity nearer to the poles, more biodiversity as you
get closer to the equator: can sustain more life
What are ecosystem services? - Correct Answer -Provisioning
-Regulating services
-Supporting services
-Cultural services
What is a K strategist? - Correct Answer -Large organisms
-Long lived
-Produce few offspring
-Extensive parental care
-Low juvenile death rate
-Occupy stable environments
What is a R strategist? - Correct Answer -Small organisms
-Short-lived
-Many offspring
-Limited parental care
-High juvenile mortality
, -Exploit unstable environments
What is the Pleistocene overkill? - Correct Answer Had extremely advanced weaponry and
kill very large animals that were not worried about us because we were so smaller
Why many animals went extinct
What did Teddy do to earn his term in office being coined as the Golden Age in
Conservation? - Correct Answer -More has been done in this time span than any other time
-Tripled the size of national forests
-Created an agency -> the forest service
-84,000,000 acres as oil and coal reserves
-Millions of acres as national monuments
-Beefed up enforcement
-Created more national parks
What is overexploitation? - Correct Answer living off the land or seas in a manner that can
not be sustained
What is the largest threat to terrestrial biodiversity around the world? - Correct Answer The
largest threat is habitat loss.
What is DDT and how did it affect wildlife and humans? - Correct Answer Insecticides:
used in WWII to control malaria and typhus, 1962 Rachel Carson wrote Silent Spring
Has been linked to diabetes, premature birth and low birth rate, developmental delays,
parkinsons, asthma, cancers
What is propagule pressure and what are pathways of invasion? - Correct Answer
Propagule pressure is the quantity, quality, and frequency of arriving organisms. Pathways
will determine the propagule pressure. It is a major force in determining invasion success.
What is acid rain? How is it caused? - Correct Answer -a chemical reaction that begins
when compounds like sulfur dioxide and nitrogen oxides are released into the air and
become Sulfuric acid and nitric acid are secondary air pollutants that are directly emitted
by power plants that form acid rain.
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